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标题：Antihyperglycemic Effect of Cephalotaxus sinensis Leaves and GLUT-4 Translocation Facilitating Activity of Its Flavonoid Constituents
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作者：Wei Li ; Rong-Ji Dai ; Yu-Hong Yu 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2007
卷号：30
期号：6
页码：1123-1129
DOI：10.1248/bpb.30.1123
出版社：The Pharmaceutical Society of Japan
摘要：The objectives of this study were to investigate the antihyperglycemic effect of Cephalotaxus sinensis leaves and to identify the active components. The antihyperglycemic effect of various fractions (FA, FB, FC, FD) of the 80% ethanol extract of the leaves was evaluated in streptozotocin (STZ)-induced diabetic rats. Among the tested fractions, FC was the most active. FC (0.48 g/kg) given orally for 10 d reduced significantly ( p <0.001) the blood glucose of STZ-induced diabetic rats. The food and water intakes of FC (0.48 g/kg)-treated diabetic rats were reduced significantly ( p <0.001) when compared to the 0.5% carboxymethyl cellulose (CMC)-treated diabetic rats. The activity-guided fractionation of the ethanol extract of C. sinensis leaves furnished three flavonoid compounds, apigenin-5- O -[α- L -rhamnopyranosyl-(1→4)-6- O -β- D -acetylglucopyranoside] (1), apigenin (2), and apigenin-5- O -[α- L -rhamnopyranosyl-(1→4)-6- O -β- D -glucopyranoside] (3). The elevation of GLUT-4 protein level in membrane preparations from mice adipocytes was detected by Western blot analysis after adipocytes were pre-incubated with FC (0.1, 1, 10 mg/ml), apigenin (0.1, 2 mg/ml) and apigenin-5- O -[α- L -rhamnopyranosyl-(1→4)-6- O -β- D -acetylglucopyranoside] (0.1, 2 mg/ml), respectively. Phytochemical investigation and HPLC-DAD analysis of FC indicated that the flavonoids were the major constituents in this fraction. These results suggest that the fraction from C. sinensis leaves is a promising drug for the treatment of diabetes, and that the flavonoids from this plant are the active constituents.
关键词：Cephalotaxus sinensis;antihyperglycemic effect;GLUT-4;translocation;apigenin;HPLC-DAD